先化简,后求值: ( x x - 2 - 4 x 2 - 2 x ) ÷ x + 2 x 2 - x ,其中x满足 x 2 ﹣ x ﹣ 2 = 0 .
(本题8分)计算:
(本题5分)计算:.
计算:.
计算:
(本题6分)计算: